Python Deprecation

set min python to 3.9, target on ruff to 3.9

pyproject.toml

@@ -8,30 +8,28 @@ authors = [
 ]
 description = "Universal payment handling for Django"
 readme = "README.rst"
-requires-python = ">=3.7"
+requires-python = ">=3.9"
 keywords = ["payments"]
 license = {text = "BSD"}
 classifiers = [
     "Environment :: Web Environment",
-    "Framework :: Django :: 3.2",
-    "Framework :: Django :: 4.1",
     "Framework :: Django :: 4.2",
     "Framework :: Django :: 5.0",
     "Framework :: Django :: 5.1",
     "Intended Audience :: Developers",
     "License :: OSI Approved :: BSD License",
     "Operating System :: OS Independent",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
     "Framework :: Django",
     "Topic :: Software Development :: Libraries :: Application Frameworks",
     "Topic :: Software Development :: Libraries :: Python Modules",
 ]
 dependencies = [
-    "Django>=3.2",
+    "Django>=4.2",
     "requests>=1.2.0",
     "django-phonenumber-field[phonenumberslite]>=5.0.0",
 ]
@@ -89,7 +87,7 @@ DJANGO_SETTINGS_MODULE = "test_settings"
 pythonpath = "."
 
 [tool.ruff]
-target-version = "py38"
+target-version = "py39"
 
 [tool.ruff.lint]
 select = [